PROJ00206

• Contract/PO #: C153574
• Contractor Name: Longmont, City of
• Contract Type: Loan
• Water District: 5
• County: Boulder
• Bill Number: SB 88-30
• Loan Projects - Doc Type: Feasibility Study

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Lake between 1934 and 1987 was 192 acre-feet. Table 5.5 summarizes annual volu-

metric and annual maximum release rates from McCall Lake between 1934 and 1987.

The maximum recorded discharge from McCall Lake was 20 cfs in 1948 and the maxi-
mum volume released from.McCall Lake waS 506 acre-feet in 1953.

C. Water Utilization

The Palmerton Ditch currently fills McCall Lake with St. Vrain Creek water.

The Palmerton Ditch has a decreed capacity of 164.31 cfs. The ditch has an
actual carrying capacity of approximatelY 55 cfs and the maximum historic diver-
sion under the Palmerton Ditch was 42 cfs on June 1, 1966.

The outlet from McCall Lake currentlY empties into the Longmont Supply
Ditch. The spillway empties into an open field which flows into Independent

Reservoir.

The City would, as part of this project, construct a structure that would

allow water diversions from the Longmont Supply Ditch to the Oligarchy Ditch.
This would give the City numerous options for use of McCall Lake water.
Options for use of McCall Lake water would include:

1. Discharge from McCall Lake to the Longmont Supply Ditch utilizing
excess ditch capacity for irrigation use at Hover Acres Park
(7.8 acres).

2. Discharge from McCall Lake into the Longmont Supply Ditch to be
used for exchange. The exchange would involve supplying Longmont
Supply Ditch users with McCall Lake water for an equivalent volume of
water to be diverted by the City at its north and south pipeline
diversion points. This exchange would occur only when the Longmont
Supply Ditch is legally entitled to divert water under its decree and
when there is exchange potential in St. Vrain Creek between the
Longmont Supply Ditch headgate and the City's pipeline diversion point
(see Figure 2.1). This exchange was decreed in Case # W 8710-77.

3. Discharge of McCall Lake water into the Oligarchy Ditch via the
Longmont Supply Ditch to irrigate several of the City's parks. This
would involve transporting untreated lake water utilizing the excess
ditch capacity of the Longmont Supply and Oligarchy Ditch to irrigate
Dawson Park (11.1 acres), Carr Park (7.0 acres), Lanyon Park (8.0
acres), Clark Park (42.5 acres), Rothrock-Dell Park (5.3 acres) and
21st and Francis (6.0 acres).

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